edmonton.webp jellyfish.webp banger.js 404 errors

I’ve been getting an increase in 404 errors hit by Googlebot recently:

66.249.69.204 - - [01/Jul/2019:20:29:17 +0000] "GET /porpoiseant/banger.js?cb=169-1&bv=2&v=15&PageSpeed=off HTTP/1.1" 404 3277 "https://fccid.io/JWC-BS5-5" "Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.96 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://ww
66.249.69.206 - - [01/Jul/2019:10:37:53 +0000] "GET /detroitchicago/edmonton.webp?a=a&cb=170-1&shcb=27 HTTP/1.1" 404 "Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.96 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"
66.249.69.208 - - [01/Jul/2019:10:37:53 +0000] "GET /porpoiseant/jellyfish.webp?a=a&cb=170-1&shcb=27 HTTP/1.1" 404  "Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.96 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"

I’m assuming this is either from a CloudFlare 3rd party app or perhaps one of the primary functions of CloudFlare. CF should really be handling these requests and not allow them to hit the back-end server.
The only third-party app I am using on CF is Google Analytics. Given the nature of the request, I’m assuming this could be an artifact from Rocket Loader or the WebP image loading function of CloudFlare Polish.

Have you seen these requests recently? Please share below so I can continue tracking this down.

Update: I’ve narrowed down the source of these requests: CloudFlare Mirage. Mirage is a CF addon intending to improve page load time by Image Virtualizing and Request Streamlining. CloudFlare uses some smart algorithms to serve mobile devices intelligently-optimized (lossy) images as well as lazy-loading the full resolution image. On top of this, Mirage manages to send all the page images over fewer network requests. Despite these supposed speed advantages, I’ve removed the Mirage tool from my websites. Here’s Why.

Leave a Reply

Your email address will not be published. Required fields are marked *